Given:
- Length of the rectangular sheet of paper = 12 1/2 cm
- Width of the rectangular sheet of paper = 10 2/3 cm

To find: Perimeter of the rectangular sheet of paper

Solution:

Step 1: Convert mixed fractions to improper fractions
- Length = 12 1/2 cm = 25/2 cm
- Width = 10 2/3 cm = 32/3 cm

Step 2: Use the formula for perimeter of a rectangle
- Perimeter = 2(Length + Width)

Step 3: Substitute values in the formula
- Perimeter = 2(25/2 cm + 32/3 cm)

Step 4: Simplify the expression
- Perimeter = 2(125/6 cm + 64/6 cm)
- Perimeter = 2(189/6 cm)
- Perimeter = 2(31 1/2 cm)
- Perimeter = 63 cm

Therefore, the perimeter of the rectangular sheet of paper is 63 cm.

Explanation:

The perimeter of a rectangle is the total distance around the outside of the rectangle. To find the perimeter, we add up the lengths of all four sides. In this case, we are given the length and width of the rectangular sheet of paper, so we can use the formula for the perimeter of a rectangle, which is 2 times the sum of the length and width. We convert the mixed fractions to improper fractions, add the lengths and widths, simplify the expression, and get the final answer.